Hitachi 987011 3-1/2-Inch Core Bit for Rotary Hammers (Discontinued by manufacturer) Outlasts traditional core bits Use for reinforced and non-reinforced concrete, natural stone, brick, block and other masonry Measures 3-1/-2-inches in diameter Optimized build for best removal rate and stays in place for heavy-duty applications Comes with a 30-day limited warranty Well-built with a simple design Use with natural stone, concrete, brick, block and other masonry Designed for use with rotary hammers 100-percent quality consistency Comes with a 30-day limited warranty